title: Regional mapping of the human MP70 (Cx50; connexin 50) gene by fluorescence in situ hybridization to 1q21.1.
abstract: OBJECTIVE
  Gap junctions play a critical role in the metabolic homeostasis and maintenance of transparency of fibers within the ocular lens. As part of a long-term effort to establish the relationship between lens gap junction proteins, normal lens development, and cataractogenesis, we report here the regional localization of the human MP70 (Connexin 50) gene.
  
  
  METHODS
  Fluorescence in situ hybridization (FISH) was used to regionally map the human MP70 gene. The DNA probe contained the entire MP70 coding region within a clone isolated from a human genomic DNA library.
  
  
  RESULTS
  The human gene encoding the lens intrinsic membrane protein MP70 was regionally mapped to q21.1 on the long arm of chromosome 1.
  
  
  CONCLUSIONS
  This study confirms the previous provisional assignment of MP70 to human chromosome 1 and regionally localizes the gene to 1q21.1. When combined with previous mapping information, these data are consistent with the hypothesis that a genetic lesion in the gene encoding the lens intrinsic membrane protein MP70 may be the underlying molecular defect for zonular pulverulent (Coppock) cataract. Furthermore, these combined data support the hypothesis that other forms of human hereditary cataract may be the result of a mutation in one or more of the genes encoding gap junction proteins found in the ocular lens.
authors.affiliation: Eleanor Roosevelt Institute, Denver, CO 80206, USA. daveg@eri.uchsc.edu
authors.forename: D D
authors.initials: DD
authors.lastname: Geyer
authors.forename: R L
authors.initials: RL
authors.lastname: Church
authors.forename: E C
authors.initials: EC
authors.lastname: Steele
authors.forename: C
authors.initials: C
authors.lastname: Heinzmann
authors.forename: T L
authors.initials: TL
authors.lastname: Kojis
authors.forename: I
authors.initials: I
authors.lastname: Klisak
authors.forename: R S
authors.initials: RS
authors.lastname: Sparkes
authors.forename: J B
authors.initials: JB
authors.lastname: Bateman
mesh_terms: D002874:Chromosome Mapping; D002878:Chromosomes, Human, Pair 1; D017630:Connexins / Q000235:genetics*; D005136:Eye Proteins / Q000235:genetics*; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D000099264:Connexin 50
chemical_list: D017630:Connexins; D005136:Eye Proteins; D000099264:Connexin 50